
<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>               DEC-31-1997
<PERIOD-START>                  JAN-01-1997
<PERIOD-END>                    DEC-31-1997
<CASH>                                25,525
<SECURITIES>                               0
<RECEIVABLES>                        332,839
<ALLOWANCES>                          10,290
<INVENTORY>                           37,966
<CURRENT-ASSETS>                     426,552
<PP&E>                             1,830,793
<DEPRECIATION>                       914,462
<TOTAL-ASSETS>                     1,365,973
<CURRENT-LIABILITIES>                330,067
<BONDS>                              250,559
<PREFERRED-MANDATORY>                      0
<PREFERRED>                                0
<COMMON>                              50,428
<OTHER-SE>                           620,487
<TOTAL-LIABILITY-AND-EQUITY>       1,365,973
<SALES>                                    0
<TOTAL-REVENUES>                   2,912,409
<CGS>                                      0
<TOTAL-COSTS>                      2,687,154
<OTHER-EXPENSES>                           0
<LOSS-PROVISION>                           0
<INTEREST-EXPENSE>                    27,790
<INCOME-PRETAX>                      197,465
<INCOME-TAX>                          77,393
<INCOME-CONTINUING>                        0
<DISCONTINUED>                             0
<EXTRAORDINARY>                            0
<CHANGES>                                  0
<NET-INCOME>                         120,072
<EPS-PRIMARY>                           2.68<F1>
<EPS-DILUTED>                           2.44<F2>
<FN>
<F1>EARNINGS PER SHARE - BASIC (IN COMPLIANCE WITH SFAS 128)
<F2>EARNINGS PER SHARE - DILUTED (IN COMPLIANCE WITH SFAS 128)
</FN>
        


</TABLE>
